Abstract: 1. Too-gin-chie, the dried herb of Chenopodium ambrodoides L., has been used as anthelmintic, for the round and hook worms. Research work in recent years showed that it has good anthelmintic activity. 2. A brief review of the literature and detailed descriptions of the macroscopical and microscopical characters of the drug are given with 16 illustrations. 3. The more important microscopical features of the drug are: (1) epidermis of the stem, with non-glandular hairs of two types: 6 to 18-celled uniseriate hairs, up to 920μ in length, with small apical cells, and 18 to 24-celled biseriate hairs; (2) glandular hairs also of two types: those having 6 to 9-celled stalk and 2 to 3-celled head, and those having 3 to 5-celled stalk and 1-celled sac-shaped head. 4. The essential oil of the drug has been studied, and its content, physical and chemical constants are given.